DE10111069A1 - Folder with combined cutting and clamping cylinder - Google Patents

Abstract

A folder for a web-fed rotary printing press comprises a first cutting and clamping device (101) for partially cutting a web (1) in order to form first cuts (44) in the web (1) and to clamp the web (1). A second cutting and clamping device (102) cuts the web (1) between the first cuts (44) to form signatures (50), the web (1) being clamped in a gap of the second cutting device (102).

Description

The present invention relates to a folder in a rotary rotary Offset printing machine according to the preamble of claim 1.

Web-fed rotary printing machines print on a continuous web of material, e.g. B. made of paper. The continuous web is cut in a cutter of a folder Form signatures, which are then folded or issued.

US 5,740,704 describes a double-cut folder. Guide the cutting cylinders no clamping process in the folder described during the cutting process through, which results in the described device the problem that it is in the Signatures during the cutting process can lead to relative movements, which in usually lead to stepped cut edges.

In US 4,957,280 a folder is described in which a web is first of a partially cut first cutting drum and then between a folding drum and Conveyor belts is guided. The part of the web that is not from the first Cutting drum was then cut by sawtooth-shaped cutting knives a second cutting device, which is arranged on the folding drum, in the way that a completely separated sheet is obtained. A front end of the To do this, the sheet that is cut into sheets is divided into columns between a variety of Clamping elements and clamping seats pressed and clamped. With the described The device can slip both in the web direction and in the web cross direction arise because of the clamping forces between the conveyor belts and the folding drum are often not large enough. This creates the risk that a step The cut edge on the signatures arises when these are removed during the cutting process move. The cutting accuracy can be due to the so-called radius effect additionally affected if multilayer paper webs and with pass through the folder at different web thicknesses. In addition, the described device a rather complicated arrangement of clamping elements to  to be able to check the position of the signatures. Furthermore, there is the problem that the surfaces of the groove strips interacting with the cutting blades are one subject to high wear and tear as the cutting blades with the grooved strips essentially always get in touch in the same place.

From the unpublished European patent application No. 00120704.2 the The applicant is a rotating conveyor belt with an integrated cutting knife containing cutting device known in which a first cut from a first Cutting cylinder and then a second cut from a cutting disc having the second cutting cylinder. The conveyor belts or Belts have sections of different cross-sectional thickness and run between the provided with corresponding recesses in a corresponding manner Cutting discs to take the cut signatures and the Redirect signatures into two streams. The straps grip the front edge of the Signature after the second cut and thus do not contribute to the situation of the Signature can be kept in a controlled manner during the second cut.

The invention is accordingly based on the object of a device for to create controlled cutting of signatures with which the accuracy with respect to the "cut-to-cut" measure and the "pressure-to-cut" measure, that is the so-called cut register is improved.

This object is achieved by the features of claim 1.

According to the present invention, a folder has a first cutter and Clamping device for partially cutting a printing material web, in particular one printed paper web, on which a first series is spaced apart arranged cuts is introduced into the web and the web at the same time through the clamping device is clamped. The folder also includes a second one Cutting and clamping device, which the web between the first cuts in the  Way cuts and clamps at the same time that signatures with smooth, not step cut edges are formed.

By clamping the web between the first and second cutters the cutting accuracy can vary from cut-to-cut as well as pressure-to- Cut, can be maintained at all times with high reliability.

The first cutting and clamping device comprises according to the preferred one Embodiment of the invention a first cutting cylinder with a clamping surface and at least one first segmented cutting element which is arranged in the axial direction seen spaced cutting surfaces or cutting surfaces is provided. The Clamping surface extends in the circumferential direction between the Cutting surfaces. The first cutting and clamping device further comprises a first Anvil cylinder, which is a coating that takes over the function of a slot bar made of elastic material, e.g. B. rubber, which with the cutting surfaces as well the clamping surfaces of the first cutting cylinder to form a first gap cooperates.

The second cutting and clamping device preferably comprises a second Cutting cylinder with a clamping surface or surface and at least one segmented second cutting element, which is seen in the axial direction at a distance has mutually arranged cutting surfaces or cutting surfaces. The second Cutting element extends in the circumferential direction between the Clamping surfaces of the second cutting cylinder. A second anvil cylinder forms the clamping surfaces or clamping surfaces of the second cutting cylinder a second Gap and thus acts as an anvil or counter cylinder for the second segmented Cutting element of the second cutting cylinder.

The folder preferably comprises a plurality of first belts or Conveyor belts and a variety of second belts or conveyor belts, wherein the web at the first interfaces, d. H. the first gap from the first and second  Strap is held. From the second groove cylinder and the second cutting cylinder the second cutting and clamping device is preferably at least one in Axial direction with spaced grooves between the clamping surfaces of the second Provide cutting and clamping device, the belts running through the grooves.

The clamping surfaces - or generally speaking the clamping elements - of the first and / or second cutting cylinder and the first and / or second anvil cylinder preferably made of urethane or have a coating made of urethane. As from the Applicant was recognized in connection with the invention, urethane is suitable for a particularly advantageous as a groove or anvil surface of the anvil cylinder, which interacts directly with the cutting element of the associated cutting cylinder, and also has a very advantageous behavior as a clamping surface, which a positionally accurate hold of the web / signatures during the cutting process ensures. However, other materials for coating the Clamping surfaces, for example silicone or a similar rubber-like material, for Get involved.

The first and / or second cutting cylinder according to the invention preferably has one Metal hub on which at least one segmented cutting element is preferred is attached by means of screws or bolts. The rest of the Cutting cylinder is formed by urethane or other similar material, which is connected to the hub, for example glued or vulcanized onto it.

The first and / or second anvil cylinders can be one in the same way Metal body / hub with an outer surface made of urethane or another Clamping material that is attached to the body, preferably glued or vulcanized is.

The cutting cylinder preferably comprises two segmented cutting elements that are around 180 degrees apart.  

In the preferred embodiment of the invention, the first and / or the second Anvil cylinders indixable in the circumferential direction, d. H. versus an original Angular position by a few angular degrees compared to the associated cutting cylinder rotatable to ensure that the associated segmented cutting knife after a certain number of cuts with a new, fresh area of Urethane surface of the anvil cylinder interacts so that an excessive Wear at only one point on the anvil cylinder through successive Further turning the same is avoided. For example, it is conceivable that Continue to turn the anvil cylinder by 2 or 3 degrees after approx. 1000 cutting processes, the remaining rotating components of the folder being in their original position maintained. By gradually or gradually moving the anvil cylinder a certain number of cutting operations or print jobs this can - compared to a conventional anvil cylinder, which is usually also called Groove cylinder is called, and in which the grooved strips are always in the same place remain - over a longer period of time without noticeable loss in Cutting behavior or transport behavior remain in use.

The distance from the center of the cutting cylinder to the center of the anvil cylinder Cutting and clamping devices are preferably adjustable so that the clamping function can be adjusted, e.g. B. for processing different webs of different thickness. The setting is preferably subjected to a force, e.g. B. by means of springs, so that the device automatically removes the centers from the cutting cylinder and Anvil cylinder compensates when the shell thickness changes.

The first and / or second cutting cylinder and the associated anvil cylinder are preferably cantilevered to allow easy replacement of the straps.

The present method creates a two or double cut arrangement that holds the web during the first and second cutting operations in a clamped Allows predetermined position, reducing the tension and precise alignment of the  Web, or the signatures during the cutting process with very high accuracy can be met.

The present device is particularly preferred for use in Suitable in connection with web-fed rotary printing presses with a high Work at speed, e.g. B. Printing presses operating at more than about 610 m per minute work because the web and the cut signatures even at high speeds due to the clamping process on the first and second cutting and clamping device recorded and guided precisely. The web and the knives work exactly as a result together.

A preferred embodiment of the present invention is described below Described with reference to the drawings.

Show in the drawings

Fig. 1 is a side view of the folding apparatus of a printing press according to the invention Rollenrotations- offset,

Fig. 2 is a detailed view of a cutting and clamping device of the folding apparatus of FIG. 1,

Fig. 3 is a reproduction of a segmented cutting element to the first cutting device, which is arranged offset in relation to a cutting element of the second cutting device of Fig. 1 in the axial direction,

Fig. 4 is a representation of the web and a cut therefrom signature that was created by the folding apparatus of FIG. 1,

Fig. 5 is a clamping and cutting operation of a cutting and clamping device of the folding apparatus of FIG. 1,

Fig. 6 belts that pass through the axially spaced grooves in the cutting cylinder of the second cutting and clamping device, and

Fig. 7 belts that pass through the axially spaced grooves in the groove cylinder of the second cutting and clamping device.

Fig. 1 shows a folding apparatus 100 having a first cutting and clamping device 101 for partly cutting a sheet 1 to the first cuts 44 to perform in the web 1 as shown in FIG. 4. The first cutting and clamping device 101 comprises a first cutting cylinder 3 with a first segmented cutting knife 4 . The first segmented cutting knife 4 has spaced knife edges for producing spaced cuts in the web 1 , which however do not cut through the entire width of the web. The first segmented cutting knife 4 works with a groove or anvil cylinder 2 of the first cutting device 101 . During the cutting process, the cutting cylinder 1 and the anvil cylinder 2 clamp the web 1 due to the elastic properties of the elastic material layer 14 , 24 applied to the circumferential surfaces of the cylinders 2 and 3 in the region of the segmented cutting knife 4 , which will be discussed in more detail below.

Fig. 5 shows a combined clamping and cutting operation of the cutting cylinder 3 and the anvil cylinder 2. The clamping elements or clamping surfaces 214 of the anvil cylinder 2 extend in the circumferential direction around the anvil cylinder 2 and can, for. B. be formed by a continuous material layer 24 , in particular made of urethane or another rubber-like material. The clamping elements or clamping surfaces 203 of the first cutting cylinder 3 likewise extend in the circumferential direction with respect to the cutting knife 4 , which has the cutting surfaces 45 spaced apart in the axial direction, as shown in FIG. 3. The cutting knife 4 thus forms first partial cuts 44 in the web 1 , and the web 1 remains clamped between the clamping surfaces 202 , 203 when it passes the first cutting and clamping device 101 .

The web 1 , after being partially cut by the first cutting device 101 , is passed between the first guide belts or belts 5 and the second guide belts or belts 6 . Each of the belts 5 and 6 comprises a plurality of belts running parallel to one another, which are arranged spaced apart in the axial direction of the cutting cylinder 3 (ie on the side in FIG. 1). The movement of the first belts 5 is determined by the guide rollers 8 , 9 , 33 , 34 , 35 . At least one of the guide rollers may be motor driven to drive the belts 5 , although the belts may alternatively be driven by the clamping action of the second cutter 102 . The rollers 8 and 9 can be pull rollers which guide the belts 5 , the web 1 and the belts 6 through a nip with the corresponding guide rollers as belts 6 . The belts 6 can comprise a similar guide roller arrangement.

The web 1 is then guided by the belts 5 , 6 to the second cutting and clamping device 102 , which comprises a second cutting cylinder 10 and a second groove or anvil cylinder 20 . The cutting cylinder 10 has a segmented cutting knife 19 which cuts the web 1 between the first cuts 44 in order to obtain a continuous cut - and thus a complete signature 50 - as shown in FIG. 4. The belts 5 , 6 are passed between the cutting surfaces 32 of the second segmented knife 19 , while the web 1 runs between the outer surfaces of the cutting cylinder 10 and the grooved cylinder 20 ( FIG. 3). As shown in Fig. 6, the belts 6 are preferably passed through the axially spaced grooves 115 in the cutting cylinder 10 so that they are not pinched. While the web 1 is being guided through the second cutting and clamping device, the web 1 is clamped by the clamping elements or clamping surfaces 114 of the second cutting cylinder 10 and the clamping elements or clamping surfaces 214 of the second anvil cylinder 20 ( FIG. 7). As shown in FIG. 7, the belts 5 can be guided through the grooves 215 in the anvil cylinder 20 . The clamping elements 114 extend in relation to the cutting surfaces 32 of the second cutting knife 19 in the circumferential direction ( FIG. 3). The clamping elements 214 preferably extend continuously around the circumference of the second anvil cylinder 20 .

The linear position of the web in the web running direction and web cross direction is controlled by the slip-free boundary condition between the gap and the web. The clamping process of the second cutting and clamping device 102 allows the web 1 to be firmly held in place, while the segmented knife 18 , 19 cuts the web 1 between the first cuts 44 ( FIG. 4). The cut-to-cut accuracy and the print-to-cut accuracy in a double-cut folder are improved by the clamping process according to the invention. Problems with step cuts, which usually occur in other double-cut devices, can thereby be avoided or at least reduced.

After the second cut, the signature 50 ( FIG. 4) is guided from the belts 5 , 6 to a subsequent section in the folder.

Fig. 2 shows the second cutting cylinder 10 and the second anvil cylinder 20 in more detail. The second cutting cylinder 10 includes an axle 16, which may be associated with a not-shown motor in driving connection to the cylinder 10 to drive. In the preferred embodiment of the invention, the axle 16 has a two-part hub 12 , which is preferably made of metal and, as shown, is preferably held together by means of screws or bolts. The segmented cutting knives 18 and 19 are inserted between the two parts of the hub 12 and are preferably also fastened to the hub 12 with the aid of the screws and bolts. However, another attachment of the cutting knife 18 , 19 to the hub is also conceivable.

In order to generate a clamping force on the material web 1 during the cutting process, an outer layer 14 made of urethane or another rubber-elastic material is arranged around the circumference of the hub 12 . The layer 14 can either be applied to the semi-cylindrical hub parts before the assembly of the hub 12 , or axially drawn onto the cylinders 10 , 20 after the hub has been screwed together, and optionally, for. B. by means of adhesive. The elastic outer layer 14 provides a continuous smooth surface that extends along the circumference of the cutting cylinder 10 from the cutting surfaces 32 . The recessed or recessed areas 36 ( FIG. 3) of the segmented cutting knife 19 , which can interact with the grooves or recesses 115 in the layer 14 , as shown in FIG. 6, may themselves lie directly on the surface of the cylinder 10 or else be coated with urethane or other material to reduce wear on the second guide belts 6 . Layer 14 can be connected to the corresponding parts of the hub before assembly, for example by gluing. If the recessed or recessed areas 36 are not coated, they are preferably blunt and mesh or correspond to the bottom surfaces of the grooves or recesses 115 ( FIG. 6), the second anvil cylinder 20 and / or cutting cylinder 10 around the second guide belts 6 circulate in the grooves 115 , not to wear excessively or to damage them. Furthermore, it can be provided that the belts 5 , 6 rotate at a different speed than the cylinders.

The grooved cylinder 20 comprises an axis 26 which can be coupled to the drive motor via a gear in order to drive the anvil cylinder 20 preferably at the same speed as the cutting cylinder 10 . However, an independent drive motor is also possible.

A hub 22 , which is preferably made of metal, can be connected to the axle 26 in a rotationally fixed manner, for example by bolts or screws. A layer of material 24 made of urethane or another rubber-elastic material which generates the desired clamping forces is preferably arranged on each side of the hub 22 , and can be applied to the hub 22 , for example, be glued on, for example before the hub 22 is assembled, or after the reassembly Hub 22 and the axis 26 are connected to the hub 22 by axially sliding an endless urethane sleeve. It is also conceivable here that the hub 22 is made from one piece.

The second groove cylinder 20 and / or the second cutting cylinder 10 are preferably indexable in the circumferential direction, in such a way that new surface sections of urethane interacting with the cutting knife 4 , 19 are provided as soon as part of the surface or the clamping surface 214 by the action the cutting knife 18 , 19 is worn. In order to enable a gradual movement of the cylinder, it can be rotated, for example, by means of a so-called harmonic drive, which can also take place during the operation of the folder.

The distance from the center of the cutting cylinder 10 to the center of the grooved cylinder 20 is preferably adjustable to adjust the clamping function, e.g. B. to be able to process webs of different thickness. A simple mechanical, pneumatic or hydraulic device can be provided in order to carry out this setting, preferably an automatic setting which is acted upon by force.

The cutting cylinder 10 and the grooved cylinder 20 are preferably overhung, which makes it easy to replace the belts on the non-overhung side. A releasable bearing can be provided to support the second end.

The design of the first cutting cylinder 3 and the first anvil cylinder 2 can be similar to that of the second cutting cylinder 10 and the second anvil cylinder 20 , with the difference that the clamping surfaces of the cutting cylinder 3 and the anvil cylinder 2 preferably do not carry any belts and therefore have a continuous, axially not have a stepped surface.

As shown in FIG. 3, the axial positions of the cutting surfaces of the cutting knives 4 and 19 of the first and second cutting cylinders 3 and 10 differ. The knives 4 of the first cutting cylinder 3 have cutting edges 45 which make the first cuts 44 in the material web 1 and thus partially cut them ( FIG. 4). The segmented cutting knives 18 and 19 of the second cutting cylinder 10 have the cutting surfaces 32 , which preferably overlap axially by a distance d with the cutting surfaces 45 of the first cutting cylinder 3 , as is indicated in FIG. 3.

The second guide belt 6 moves within the recessed or recessed area 36 between the cutting surfaces 32 of the segmented cutting knives 18 , 19 of the second cutting cylinder 10 .

By providing the cutting and clamping surfaces on the same cutting cylinder a more precise cut can be made possible. The train can be stopped at any time so that a more accurate signature and cut formation can be ensured. The coating of urethane is particularly preferred in order to ensure the clamping function of the to enable the present device.

Each of the first cuts has a certain length, which is determined by the width of the cutting surfaces 45 ( FIG. 3).

The first and / or the second cutting cylinder 3 , 10 can have a multiplicity of segmented cutting knives 18 , 19 , for example 2, 3 or 4 cutting knives, which are respectively arranged offset from one another by 180, 120 or 90 degrees.

The term "clamping elements" or clamping surfaces is to be understood as the sections of the first or second cutting cylinder 3 , 10 which extend from the cutting knife to the cutting knife around the circumference of the cylinder. The clamping elements 114 , 203, together with the associated clamping elements or clamping surfaces 202 of the first anvil cylinder 2 , or the clamping surfaces or clamping elements 214 of the second anvil cylinder 20, form a clamping gap in which the material web 1 or the signature for positionally accurate, register-correct guidance during the respective Cutting process is clamped.

Finally, the elastic rubber-like clamping elements 114 , 214 , 203 , 202 can also be attached to the first and second cutting cylinders, or the first and second anvil cylinders, likewise by means of adhesive tape, preferably double-sided adhesive tape.

List of reference numbers

1

train

2nd

Groove cylinder

3rd

Cutting cylinder

4

segmented cutting knife

5

first guide belt

6

second guide belt

8th

Guide roller

9

Guide roller

10th

second cutting cylinder

12th

two-piece hub

14

elastic outer layer

16

axis

18th

knife

19th

knife

20th

second groove cylinder

22

hub

24th

layer

26

axis

32

Cutting surface

33

Guide roller

34

Guide roller

35

Guide roller

36

excluded or reset areas

44

first cuts

45

Cutting surfaces

49

whole cut

50

signature

100

Folder

101

first cutting and clamping device

102

second cutting u. Clamping device

114

Clamping elements or clamping surfaces of the second cutting cylinder

115

Grooves

202

Clamping surfaces of the first cutting cylinder

203

Clamping surfaces of the first anvil cylinder

214

Clamping elements or clamping surfaces of the second anvil cylinder

215

Grooves

Claims (14)

1. folder in a web-fed rotary printing press, with a first cutting and clamping device ( 101 ) for making first cuts ( 44 ) in a running material web ( 1 ), and with a second cutting and clamping device ( 102 ) for making more first cuts ( 44 ) to a continuous cut ( 49 ), additional cuts in the material web ( 1 ) in such a way that a signature ( 50 ) with smooth cut edges is created, characterized in that the second cutting and clamping device ( 102 ) has one comprises a second anvil cylinder ( 2 ) cooperating, having second cutting elements ( 18 , 19 ), second cutting cylinder ( 10 ), which is provided with a coating ( 14 ) extending around the circumference of the cylinder and made of elastic material, which material web ( 1 ) during the introduction of the second cuts in a between the second anvil cylinder ( 20 ) and the second cutting cylinder ( 10 ) ge formed gap jams and leads. 2. Device according to claim 1, characterized in that the second cutting element ( 18 , 19 ) is designed as a segmented cutting knife with axially spaced cutting surfaces ( 32 ) and recessed areas ( 36 ) arranged therebetween. 3. Device according to claim 2, characterized in that in the recessed areas ( 36 ) of the segmented cutting knife ( 18 , 19 ) guide belts ( 6 ) for transporting the signatures ( 50 ) are arranged. 4. The device according to claim 3, characterized in that in the peripheral surface ( 24 ) of the second anvil cylinder ( 10 ) associated with the second anvil cylinder ( 20 ) grooves ( 215 ) are formed, through which cooperate with the guide belt ( 6 ) further guide belt ( 5 ) for guiding the signatures ( 50 ) after the material web ( 1 ) has been severed completely. 5. Device according to one of the preceding claims, characterized in that the coating of elastic material ( 14 ) of the second cutting cylinder ( 10 ) consists of urethane, or contains such. 6. Device according to one of the preceding claims, characterized in that the second cutting cylinder ( 10 ) comprises a two-part hub ( 22 ) to which the coating ( 14 ) made of elastic material is applied. 7. The device according to claim 6, characterized in that the elastic coating ( 14 ) is glued to the outer surface of the hub ( 22 ). 8. Device according to one of the preceding claims, characterized in that the coating ( 14 ) made of elastic material projects in the radial direction over the cutting element ( 18 , 19 ). 9. Device according to one of the preceding claims, characterized in that the second anvil cylinder ( 20 ) is also provided with a coating ( 214 ) made of elastic material, in particular urethane. 10. Device according to one of the preceding claims, characterized in that the second anvil cylinder ( 20 ) has a two-part hub, to which the elastic coating ( 214 ) is applied. 11. Device according to one of the preceding claims, characterized in that the first cutting element ( 4 ) of the first cutting and clamping device ( 101 ) is also formed by a segmented cutting knife with spaced cutting surfaces ( 45 ), the first and the second segmented cutting knives ( 4 , 19 ) are arranged axially offset from one another in such a way that the first ( 44 ) and second cuts are made in the material web ( 1 ) with an overlap (d). 12. Device according to one of the preceding claims, characterized in that the second cutting cylinder ( 10 ) with respect to the second anvil cylinder ( 20 ) is indexable. 13. Device according to one of the preceding claims, characterized in that the second cutting cylinder ( 10 ) carries at least two cutting elements ( 18 , 19 ). 14. Device according to one of claims 2 to 13, characterized in that the coating ( 14 ) made of elastic material extends through the recessed areas ( 36 ).